I don't really have a theory that is sure to look for a good bounty, I only have opinions about the experience I experienced and what I did when searching for a bounty campaign, I will first see the bounty manager, if the bounty manager is already well-known it will likely have a lot of success because already competent, the second is the project website and also the whitepaper and roadmap, if it looks serious then I'm sure it's a good project